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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bfa9d3f83d2faa2beaedbd2892ce785863f582c04e842de6f29154841834dea' 
  AND token = 'xCUyycxfzBULKWk4NM1Vp2E+F+c7fRaTYkfydzit/gU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}